It was a Pacific Flyway party last night. Heavy migration from San Diego to Seattle. Birds definitely took advantage of the south winds associated with the leading edge of the incoming cold front.
I threw in a snapshot of the National Composite radar today for another look at the interaction of weather and migration. With a big storm front draped across the central part of the country it is easy to see migration out in front of it and nothing immediately behind it.
A few more Purple Martin reports in the Portland area but that’s about it. The big push is just around the corner as the Central Valley is loaded with migrants.